java - 数组列表的一个索引处的多个字符串

Question

我这里有一个带有两个字符串的构造函数:

public class person
{
    String first;
    String last;
    public person (String first, String last)
    {
        this.first = first;
        this.last = last;
    }
    public String toString()
    {
        String result = first + "\n";
        result += last + "\n";

        return result;
    }
}

以及创建构造函数的两个对象的主要方法:

import java.util.ArrayList;
public class k
{
    public static void main (String[] args)
    {
        ArrayList<person> list = new ArrayList<person>();
        person ken = new person ("Ken", "Smith");
        person ben = new person ("Ben", "Smith");

        list.add (ken);
        list.add (ben);

        System.out.println (list.get(0));
    }
}

现在代码打印 Ken Smith。我的问题是:如何让它只打印 Ken 而不是 Ken Smith？

Answer 1

按照惯例，Java 类名以大写字母开头。接下来，您覆盖 toString() 以打印两个名称。只需为名字添加一个 getter(对于此示例，我也为姓氏添加了一个 getter)

public class Person {
    String first;
    String last;

    public Person(String first, String last) {
        this.first = first;
        this.last = last;
    }

    public String getFirst() {
        return first;
    }

    public String getLast() {
        return last;
    }

    public String toString() {
        String result = first + "\n";
        result += last + "\n";

        return result;
    }
}

然后你可以调用(在main中)类似

System.out.println (list.get(0).getFirst());